SYSTEM RESEARCH ON APPLICATION OF TCSC TECHNOLOGY IN Yi-Feng SYSTEM OF NORTHEASE CHINA GRID

摘要

Yimin power plant is located in Hulunbeier, East Inner Mongolia. After its enlargement the whole capacity would be 2200 MW in 2007 while the capacity need to be sent out was 2090 MW. By 2010, six 600MW generators will also be built in Hulunbeier while the capacity need to be sent out is 3420 MW. In order to transmission the electricity, a ±500kV DC transmission system will be built from Hulunbeier to Shenyang, whose capacity is 3000 MW. The redundant 420 MW is still to be transmitted by the AC system via two 500 kV Yi-Feng lines. By then, the maximum power to be transmitted by two 500 kV Yi-Feng lines will be 2510 MW.In order to transmit the power mentioned above, two plans including building 500 kV lines or building SC equipment could be adopt. After calculating the system transient stability using a three phase fault, the number of new lines needed to be built is made certain. Also FSC plan, TCSC plan and FSC+TCSC plan were put forward and the compensation degrees were calculated too. Then SSR research was carried out according to different compensation degree. The result showed that SSR would occur because the compensation degrees were too high in order to satisfy the need of transient stability when a three phase fault occurs.According to the regulation of power system safety and stability, transmission lines from power plants to the grid could be assessed using a single-phase permanent fault or using a three-phase fault together with excising the generators when necessary. Therefore, the transmission lines from Yimin power plant were assessed using a single-phase permanent fault and the necessary minimum compensation degree is made certain. Thus the minimum compensation degree was decreased to a reasonable level. After SSR calculation the plan of 15%TCSC+30FSC was commended after overall comparison, due to the fact that it can not only meet the need of transient stability but also restrain SSR.Based on the recommended plan, the controlling scheme of TCSC was also carried out. After electric calculation, the configuration principle of the HV shunt reactors was carried out too, which recommend that the SC equipment should be installed on the line end of the existed HV shunt reactors instead of on the bus end of the reactors.